When the submitter referenced "open source alternatives that go by similar names", he was referring to ophcrack. Similar features are also available from Cain and Abel, and John the Ripper.
I maintain a list of top password crackers and sniffers as part of my SecTools.Org site.
While the submitter is correct that they have much more competition now, I still wish to congratulate the former L0pht guys on the new release!
nmap -PN -T4 -p139,445 -n -v --script=smb-check-vulns --script-args safe=1 [targetnetworks]
For more details, see the announcement at http://insecure.org.
-Fyodor
Somebody ought to cross ball point pens with coat hangers so that the pens will multiply instead of disappear.